package org.eminem.cloud.gatewayzuulaggregation.controller;

import com.google.common.collect.Maps;
import org.eminem.cloud.gatewayzuulaggregation.domain.User;
import org.eminem.cloud.gatewayzuulaggregation.service.AggregationService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;
import rx.Observable;
import rx.Observer;

import java.util.HashMap;


@RestController
public class AggregationController {

    public static final Logger LOGGER = LoggerFactory.getLogger(AggregationController.class);

    @Autowired
    AggregationService aggregationService;

    @GetMapping("/aggregate/{id}")
    public DeferredResult<HashMap<String,User>> aggregation(@PathVariable Long id) {
        Observable<HashMap<String,User>> result = this.aggregationObservable(id);
        return this.toDeferredResult(result);
    }

    public Observable<HashMap<String,User>> aggregationObservable(Long id) {
        //合并两个或者多个Observables发射出的数据项，根据指定的函数变换他们
        return Observable.zip(this.aggregationService.getUserById(id),this.aggregationService.getMoiveUserById(id),
                (user,movieUser)->{
                  HashMap<String,User> map = Maps.newHashMap();
                  map.put("user",user);
                  map.put("movieUser",movieUser);
                  return map;
                });
    }

    public DeferredResult<HashMap<String,User>> toDeferredResult(Observable<HashMap<String,User>> details) {
        DeferredResult<HashMap<String,User>> result = new DeferredResult<>();
        //订阅
        details.subscribe(new Observer<HashMap<String, User>>() {
            @Override
            public void onCompleted() {
                LOGGER.info("完成...");
            }

            @Override
            public void onError(Throwable throwable) {
                LOGGER.error("发生错误...");
            }

            @Override
            public void onNext(HashMap<String, User> stringUserHashMap) {
                result.setResult(stringUserHashMap);
            }
        });
        return result;
    }
}
